In case you can not access the Firefox store, you can also download the ".xpi" add-on
from this link.

In order to install the Near Road OKC, Oklahoma Air Quality Widget on your favorite iPhone or iPod device,
just launch the internet browser from your device and open the web page:
"
http://ios.aqicn.org/?10178".

Then click on this icon to install the widget as an application
directly accessible from your iPhone homescreen.

Or just scan this QR-code:

You can download the Near Road OKC, Oklahoma Air Quality Widget for your favorite Windows Mobile 8 or 8.1,
directly from the Microsoft application store: